Thermoluminescence properties of Cr, Si, and Mg co-doped Al2O3 ceramics plates under X-ray irradiation

Abstract The thermoluminescence (TL) properties and precise dose distribution measurement capabilities of Cr, Si, and Mg co-doped Al 2 O 3 ceramics (Al 2 O 3 :Cr,Si,Mg) plates were investigated under X-ray irradiation. The co-doping of Si and Mg significantly enhanced the TL sensitivity, approximately doubling it compared to conventional Al 2 O 3 :Cr plates, due to the creation of new trapping levels. The TL dose response was proportional in the dose range of 0.5 to 5 Gy, and off-axis ratio (OAR) measurements confirmed the high spatial resolution and accuracy of the plates to reproduce the radiation distributions. This study is the first to evaluate TL plates of this size (200 × 200 mm 2 ) that utilize Al 2 O 3 as the host material, and demonstrate their significant potential for radiotherapy dosimetry systems. This significant contribution highlights the potential of Al 2 O 3 :Cr,Si,Mg ceramic plates to transform dosimetry systems for radiotherapy by providing a combination of high sensitivity, spatial resolution, and robustness. The results of this study lay the groundwork for the development and practical application of large-area TL imaging devices in medical dose verification.